+221 Odds Explained
- Decimal
- 3.21
- American
- +221
- Fractional
- 221/100
- Implied probability
- 31.15%
- Polymarket
- 31¢
- $100 wins
- 221.00
- American
- +221
- Fractional
- 221/100
- Implied probability
- 31.15%
- Polymarket
- 31¢
- Profit
- 221.00
- Total return
- 321.00
3.210 decimal, +221 American, 31.15% implied probability
American odds of +221 mean
a 100 stake wins 221
. In decimal notation that is 3.21, in fractional notation 221/100, and the implied probability is 31.15%. On a prediction market the same price is a 31¢ share.
What +221 pays
A 100 stake at +221 returns 321.00 in total: your 100 back plus 221.00 profit. To win exactly 100 you would stake 45.25. The table covers the stakes people actually use.
| Stake | Profit | Total return |
|---|---|---|
| 10 | 22.10 | 32.10 |
| 25 | 55.25 | 80.25 |
| 50 | 110.50 | 160.50 |
| 100 | 221.00 | 321.00 |
| 500 | 1,105.00 | 1,605.00 |
| 1,000 | 2,210.00 | 3,210.00 |
Break-even and long-run results
The implied probability of +221 is 31.15%, and that number is also the break-even win rate: win more often than 31.15% of the time at this price and you profit in the long run, win less often and you lose. The table shows the return on stake at a few win rates, including the break-even rate itself.
| Win rate | Return on stake |
|---|---|
| 31% | -0.5% |
| 50% | 60.5% |
| 55% | 76.6% |
| 60% | 92.6% |
| 65% | 108.7% |
+221 is an underdog price: the bookmaker gives this outcome an implied chance of 31.15%, and the payout of 221.00 on 100 reflects it. Underdogs in this band are where public money and bookmaker margin often disagree, so it pays to compare prices across books before taking one.
The vig at +221
If both sides of a two-way market were priced at +221, the implied probabilities would add up to -37.69% above 100%. That excess is the overround, or vig; as a share of stakes it is a -60.50% margin for the bookmaker. Removing it leaves fair odds of 2.00 decimal ( +100) on each side. Use the devig calculator to do the same for any market.
+221 on a betting exchange
Exchanges charge commission on net winnings, so the price you see is not the price you get. At 2% commission +221 is worth 3.166 decimal (+217 American); at 5% it drops to 3.100 (+210). Those are the bookmaker prices you would need to beat.
| Commission | Effective decimal | Effective American | Break-even |
|---|---|---|---|
| 2% | 3.166 | +217 | 31.59% |
| 5% | 3.100 | +210 | 32.26% |
Same price in other formats
Same price in other formats
Nearby prices
Nearby prices
Frequently asked questions
What does +221 mean in betting?
+221 is an American price. Positive numbers show the profit on a 100 stake; negative numbers show the stake needed to win 100. At +221 the implied probability is 31.15% and a 100 stake returns 321.00.
What is +221 in decimal odds?
+221 converts to 3.210 in decimal odds (usually shown as 3.21). Decimal odds are the total return per unit staked, so multiply your stake by 3.210 to get the return.
What is +221 as a fraction?
+221 is 221/100 in fractional odds, the traditional bookmaker notation where the top number is profit and the bottom number is stake.
How much do I win on a 100 bet at +221?
A 100 stake at +221 wins 221.00 in profit and returns 321.00 including the stake. To win exactly 100 you would stake 45.25.
What win rate do I need at +221?
The break-even win rate equals the implied probability, 31.15%. Winning more often than that at this price is profitable over the long run; winning less often loses money.